ADVANCES IN COMPREHENSIVE GYROKINETIC SIMULATIONS OF TRANSPORT IN TOKAMAKS

Conference · Fri Oct 01 04:00:00 EDT 2004

OSTI ID:836646

RE, WALTZ ^[1]; J, CANDY; FL, HINTON; C, ESTRADA-MILA; JE, KINSEY

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1. GENERAL ATOMICS

A continuum global gyrokinetic code GYRO has been developed to comprehensively simulate core turbulent transport in actual experimental profiles and enable direct quantitative comparisons to the experimental transport flows. GYRO not only treats the now standard ion temperature gradient (ITG) mode turbulence, but also treats trapped and passing electrons with collisions and finite {beta}, equilibrium ExB shear stabilization, and all in real tokamak geometry. Most importantly the code operates at finite relative gyroradius ({rho}{sub *}) so as to treat the profile shear stabilization and nonlocal effects which can break gyroBohm scaling. The code operates in either a cyclic flux-tube limit (which allows only gyroBohm scaling) or a globally with physical profile variation. Rohm scaling of DIII-D L-mode has been simulated with power flows matching experiment within error bars on the ion temperature gradient. Mechanisms for broken gyroBohm scaling, neoclassical ion flows embedded in turbulence, turbulent dynamos and profile corrugations, plasma pinches and impurity flow, and simulations at fixed flow rather than fixed gradient are illustrated and discussed.

• Research Organization: GENERAL ATOMICS
• Sponsoring Organization: USDOE
• DOE Contract Number: FG03-95ER54309
• OSTI ID: 836646
• Report Number(s): GA-A24848
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
ELECTRONS
GEOMETRY
IAEA
ION TEMPERATURE
PLASMA
SHEAR
STABILIZATION
THERMONUCLEAR REACTORS
TRANSPORT
TURBULENCE